EMG of serratus anterior, upper, middle, and lower trapezius during glenohumeral abduction in a

18 Pages·2017·0.28 MB·English

University of North Dakota
UND Scholarly Commons
Physical Therapy Scholarly Projects Department of Physical Therapy
2017
EMG of Serratus Anterior, Upper, Middle, and
Lower Trapezius during Glenohumeral Abduction
in a Patient with Scapular Dyskinesia: A Case Study
Tyler Bentrup
University of North Dakota
Byron Flett
University of North Dakota
Joshua Sorvig
University of North Dakota
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Recommended Citation
Bentrup, Tyler; Flett, Byron; and Sorvig, Joshua, "EMG of Serratus Anterior, Upper, Middle, and Lower Trapezius during
Glenohumeral Abduction in a Patient with Scapular Dyskinesia: A Case Study" (2017).Physical Therapy Scholarly Projects. 658.
https://commons.und.edu/pt-grad/658
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EMG of Serratus Anterior, Upper, Middle, and Lower Trapezius during
Glenohumeral Abduction in a Patient with Scapular Dyskinesia: A Case Study
by
Tyler Bentrup, SPT
Bachelor of Science in Biology,
University of Missouri- St. Louis, 2015
Bryon Flett, SPT
Bachelor of Science in Kinesiology
Western Washington University, 2015
Joshua Sorvig, SPT
Bachelor of Science in General Studies
University of North Dakota, 2016
A Scholarly Project Submitted to the Graduate Faculty of the
Department of Physical Therapy
School of Medicine
University of North Dakota
in partial fulfillment of the requirements for the degree of
Doctor of Physical Therapy
Grand Forks, North Dakota
October, 2017
1
This Scholarly Project, submitted by Tyler Bentrup, Bryon Flett, and Joshua
Sorvig in partial fulfillment of the requirements for the Degree of Doctor of
Physical Therapy from the University of North Dakota, has been read by the
Advisor and Chairperson of Physical Therapy under whom the work has been
done and is hereby approved.
(~~~~
(Graduate School Advisor)
(Chairperso ,Physical Therapy)
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PERMISSION
Title EMG of Serratus Anterior, Upper, Middle, and Lower
Trapezius during Glenohumeral Abduction in a Patient with
Scapular Dyskinesia: A Case Study
Department Physical Therapy
Degree Doctor of Physical Therapy
In presenting this Scholarly Project in partial fulfillment of the requirements
for a graduate degree from the University of North Dakota, I agree that the
Department of Physical Therapy shall make it freely available for inspection. I
further agree that permission for extensive copying for scholarly purposes may
be granted by the professor who supervised my work or, in his/her absence, by
the Chairperson of the department. It is understood that any copying or
publication or other use of this Scholarly Project or part thereof for financial gain
shall not be allowed without my written permission. It is also understood that due
recognition shall be given to me and the University of North Dakota in any
scholarly use which may be made of any material in this Scholarly Project.
Sf'
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Signature
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TABLE OF CONTENTS
LIST OF FIGURES ..................................................................................... 5
LIST OF TABLES ..................................................................................... 6
ABSTRACT ..................................................................................... 7
CHAPTER
I. INTRODUCTION ......................................................... 8
II. METHODS .................................................................. 10
III. RESULTS ................................................................... 10
IV. DISCUSSION ............................................................. 21
IV. LIMITATIONS ............................................................. 22
REFERENCES .. ................................................................................... 23
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LIST OF FIGURES
Figure 1. Ratio of EMG Activity of Right Upper Extremity During
Glenohumeral Abduction ............................................................. 13
Figure 2. Ratio of EMG Activity of Left Upper Extremity During G
Glenohumeral Abduction ............................................................. 14
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LIST OF TABLES
Table 1. Ratios of Serratus Anterior EMG to Trapezius EMG During Slow
Speed Abduction ......................................................................... 11
Table 2. Ratios of Serratus Anterior EMG to Trapezius EMG During
Moderate Speed Abduction ......................................................... 12
Table 3. Ratios of Serratus Anterior EMG to Trapezius EMG During
Fast Speed Abduction ................................................................. 12
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ABSTRACT
Introduction. The purpose of this case study was to examine the differences in
muscle activation between the right and left sided upper trapezius, middle
trapezius, lower trapezius and serratus anterior in a participant with scapular
dyskinesis.
Methods. EMG activity was recorded using a Noraxont TeleMy02400 G2
telemetry unit with a sampling rate of 1 kHz on the aforementioned muscles.
Results. In comparing UE ratios of EMG activity, it appears that the left lower
trapezius exerts a significant amount more of energy than the right lower
trapezius.
Conclusion. This study may demonstrate the importance of bilateral lower
trapezius muscular strength training in order to counteract the anterior tilt motion
performed by the serratus anterior in patients with non-symptomatic scapular
dyskinesis.
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CHAPTER I
INTRODUCTION
Scapular dyskinesia has been a well studied topic over the past couple of
decades with the influence behind it being the prevalence of shoulder pain and
the correlation with poor scapular kinetics. In one study by Hillary, et al(2017),
they determined that in patients with scapular dyskinesis are not any more likely
to have pain due to their abnormal mechanics. Other purposes for studies have
been to determine which muscles accomplish different functions on the scapula,
including appropriate EMG ratios comparing the upper trapezius to the lower
trapezius and each of those muscles to the serratus anterior (Tomonobu, 2014).
Therefore, with scapular dyskinesis not being an absolute cause of pain, and
proper EMG ratios of different muscles already being researched this study's
purpose is to look at a single subject with scapular dyskinesis and determine
which muscles were causing the abnormal movement of the scapula during
shoulder abduction.
Purpose
The purpose of this pilot study was to analyze scapular biomechanics in a
single subject experiencing abnormal movement patterns in the left scapula with
bilateral shoulder abduction in a slow, moderate, and fast biomechanical speed.
Scapular dyskinesis has been a widely researched topic in physiotherapy as
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research has shown that many individuals experience minimal to no symptoms
with this diagnosis.
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